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ARM: Add RTC device for ARM platforms.

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This change implements a PL031 real time clock.

--HG--
rename : src/dev/arm/timer_sp804.cc => src/dev/arm/rtc_pl031.cc
rename : src/dev/arm/timer_sp804.hh => src/dev/arm/rtc_pl031.hh
This commit is contained in:
Ali Saidi 2012-03-01 17:26:31 -06:00
parent 08187e3916
commit 3876105bdb
6 changed files with 411 additions and 18 deletions
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21
src/base/time.cc
View file

@ -28,6 +28,8 @@
* Authors: Nathan Binkert
*/
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <sstream>
@ -144,3 +146,22 @@ sleep(const Time &time)
nanosleep(&ts, NULL);
#endif
}
time_t
mkutctime(struct tm *time)
{
time_t ret;
char *tz;
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
ret = mktime(time);
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
return ret;
}

2
src/base/time.hh
View file

@ -268,4 +268,6 @@ operator<<(std::ostream &out, const Time &time)
return out;
}
time_t mkutctime(struct tm *time);
#endif // __BASE_TIME_HH__

1
src/dev/arm/SConscript
View file

@ -52,6 +52,7 @@ if env['TARGET_ISA'] == 'arm':
Source('timer_sp804.cc')
Source('rv_ctrl.cc')
Source('realview.cc')
Source('rtc_pl031.cc')
Source('timer_cpulocal.cc')
DebugFlag('AMBA')

251
src/dev/arm/rtc_pl031.cc Normal file
View file

@ -0,0 +1,251 @@
/*
* Copyright (c) 2010-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
#include "base/intmath.hh"
#include "base/time.hh"
#include "base/trace.hh"
#include "debug/Checkpoint.hh"
#include "debug/Timer.hh"
#include "dev/arm/amba_device.hh"
#include "dev/arm/rtc_pl031.hh"
#include "dev/mc146818.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
using namespace AmbaDev;
PL031::PL031(Params *p)
: AmbaIntDevice(p), timeVal(mkutctime(&p->time)), lastWrittenTick(0),
loadVal(0), matchVal(0), rawInt(false), pendingInt(false),
matchEvent(this)
{
pioSize = 0xfff;
}
Tick
PL031::read(PacketPtr pkt)
{
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
assert(pkt->getSize() == 4);
Addr daddr = pkt->getAddr() - pioAddr;
pkt->allocate();
uint32_t data;
DPRINTF(Timer, "Reading from RTC at offset: %#x\n", daddr);
switch (daddr) {
case DataReg:
data = timeVal + ((curTick() - lastWrittenTick) / SimClock::Int::s);
break;
case MatchReg:
data = matchVal;
break;
case LoadReg:
data = loadVal;
break;
case ControlReg:
data = 1; // Always enabled otherwise there is no point
break;
case IntMask:
data = maskInt;
break;
case RawISR:
data = rawInt;
break;
case MaskedISR:
data = pendingInt;
break;
default:
if (AmbaDev::readId(pkt, ambaId, pioAddr)) {
// Hack for variable sized access
data = pkt->get<uint32_t>();
break;
}
panic("Tried to read PL031 at offset %#x that doesn't exist\n", daddr);
break;
}
switch(pkt->getSize()) {
case 1:
pkt->set<uint8_t>(data);
break;
case 2:
pkt->set<uint16_t>(data);
break;
case 4:
pkt->set<uint32_t>(data);
break;
default:
panic("Uart read size too big?\n");
break;
}
pkt->makeAtomicResponse();
return pioDelay;
}
Tick
PL031::write(PacketPtr pkt)
{
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
assert(pkt->getSize() == 4);
Addr daddr = pkt->getAddr() - pioAddr;
pkt->allocate();
DPRINTF(Timer, "Writing to RTC at offset: %#x\n", daddr);
switch (daddr) {
case DataReg:
break;
case MatchReg:
matchVal = pkt->get<uint32_t>();
resyncMatch();
break;
case LoadReg:
lastWrittenTick = curTick();
timeVal = pkt->get<uint32_t>();
loadVal = timeVal;
resyncMatch();
break;
case ControlReg:
break; // Can't stop when started
case IntMask:
maskInt = pkt->get<uint32_t>();
break;
case IntClear:
if (pkt->get<uint32_t>()) {
rawInt = false;
pendingInt = false;
}
break;
default:
if (AmbaDev::readId(pkt, ambaId, pioAddr))
break;
panic("Tried to read PL031 at offset %#x that doesn't exist\n", daddr);
break;
}
pkt->makeAtomicResponse();
return pioDelay;
}
void
PL031::resyncMatch()
{
DPRINTF(Timer, "Setting up new match event match=%d time=%d\n", matchVal,
timeVal);
uint32_t seconds_until = matchVal - timeVal;
Tick ticks_until = SimClock::Int::s * seconds_until;
if (matchEvent.scheduled()) {
DPRINTF(Timer, "-- Event was already schedule, de-scheduling\n");
deschedule(matchEvent);
}
schedule(matchEvent, curTick() + ticks_until);
DPRINTF(Timer, "-- Scheduling new event for: %d\n", curTick() + ticks_until);
}
void
PL031::counterMatch()
{
DPRINTF(Timer, "Counter reached zero\n");
rawInt = true;
bool old_pending = pendingInt;
pendingInt = maskInt & rawInt;
if (pendingInt && ~old_pending) {
DPRINTF(Timer, "-- Causing interrupt\n");
gic->sendInt(intNum);
}
}
void
PL031::serialize(std::ostream &os)
{
DPRINTF(Checkpoint, "Serializing Arm PL031\n");
SERIALIZE_SCALAR(timeVal);
SERIALIZE_SCALAR(lastWrittenTick);
SERIALIZE_SCALAR(loadVal);
SERIALIZE_SCALAR(matchVal);
SERIALIZE_SCALAR(rawInt);
SERIALIZE_SCALAR(maskInt);
SERIALIZE_SCALAR(pendingInt);
bool is_in_event = matchEvent.scheduled();
SERIALIZE_SCALAR(is_in_event);
Tick event_time;
if (is_in_event){
event_time = matchEvent.when();
SERIALIZE_SCALAR(event_time);
}
}
void
PL031::unserialize(Checkpoint *cp, const std::string &section)
{
DPRINTF(Checkpoint, "Unserializing Arm PL031\n");
UNSERIALIZE_SCALAR(timeVal);
UNSERIALIZE_SCALAR(lastWrittenTick);
UNSERIALIZE_SCALAR(loadVal);
UNSERIALIZE_SCALAR(matchVal);
UNSERIALIZE_SCALAR(rawInt);
UNSERIALIZE_SCALAR(maskInt);
UNSERIALIZE_SCALAR(pendingInt);
bool is_in_event;
UNSERIALIZE_SCALAR(is_in_event);
Tick event_time;
if (is_in_event){
UNSERIALIZE_SCALAR(event_time);
schedule(matchEvent, event_time);
}
}
PL031 *
PL031Params::create()
{
return new PL031(this);
}

136
src/dev/arm/rtc_pl031.hh Normal file
View file

@ -0,0 +1,136 @@
/*
* Copyright (c) 2010-2012 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
#ifndef __DEV_ARM_RTC_PL310_HH__
#define __DEV_ARM_RTC_PL310_HH__
#include "base/range.hh"
#include "dev/arm/amba_device.hh"
#include "params/PL031.hh"
/** @file
* This implements the ARM Primecell 031 RTC
*/
class PL031 : public AmbaIntDevice
{
protected:
enum {
DataReg = 0x00,
MatchReg = 0x04,
LoadReg = 0x08,
ControlReg = 0x0C,
IntMask = 0x10,
RawISR = 0x14,
MaskedISR = 0x18,
IntClear = 0x1C,
};
/* Seconds since epoch that correspond to time simulation was started at the
* begining of simulation and is then updated if ever written. */
uint32_t timeVal;
/* Time when the timeVal register was written */
Tick lastWrittenTick;
/* Previous load value */
uint32_t loadVal;
/* RTC Match Value
* Cause an interrupt when this value hits counter
*/
uint32_t matchVal;
/** If timer has caused an interrupt. This is irrespective of
* interrupt enable */
bool rawInt;
/** If the timer interrupt mask that is anded with the raw interrupt to
* generate a pending interrupt
*/
bool maskInt;
/** If an interrupt is currently pending. Logical and of CTRL.intEnable
* and rawInt */
bool pendingInt;
/** Called when the counter reaches matches */
void counterMatch();
EventWrapper<PL031, &PL031::counterMatch> matchEvent;
/** Called to update the matchEvent when the load Value or match value are
* written.
*/
void resyncMatch();
public:
typedef PL031Params Params;
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
/**
* The constructor for RealView just registers itself with the MMU.
* @param p params structure
*/
PL031(Params *p);
/**
* Handle a read to the device
* @param pkt The memory request.
* @param data Where to put the data.
*/
virtual Tick read(PacketPtr pkt);
/**
* Handle writes to the device
* @param pkt The memory request.
* @param data the data
*/
virtual Tick write(PacketPtr pkt);
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string &section);
};
#endif // __DEV_ARM_RTC_PL031_HH__

18
src/dev/mc146818.cc
View file

@ -176,24 +176,6 @@ MC146818::readData(uint8_t addr)
}
}
static time_t
mkutctime(struct tm *time)
{
time_t ret;
char *tz;
tz = getenv("TZ");
setenv("TZ", "", 1);
tzset();
ret = mktime(time);
if (tz)
setenv("TZ", tz, 1);
else
unsetenv("TZ");
tzset();
return ret;
}
void
MC146818::tickClock()
{